21 results about "Lanthanum hexaboride" patented technology

This invention relates to the field of welding electrodes for duplex stainless steel, specifically to a welding electrode for duplex stainless steel and its preparation method. When residual stress at the weld seam of 2209 duplex stainless steel is eliminated through high-temperature heat treatment, the mechanical properties and corrosion resistance of the weld seam significantly decrease. To address the above technical problem, this invention provides a welding electrode for duplex stainless steel that effectively slows down the phase transformation rate during high-temperature heat treatment, avoids excessive austenite formation, and maintains the balance of the duplex structure. The electrode coating composition specifically includes lanthanum hexaboride and Ti-6Al-4V alloy, which have grain-refining effects and simultaneously inhibit the precipitation of harmful intermetallic phases. This effectively suppresses the precipitation of harmful phases such as the σ phase during weld heat treatment, ensures the solid solubility of chromium and molybdenum, and allows the weld seam to retain excellent comprehensive properties after high-temperature treatment.

The application discloses a rare earth heat-insulating automobile window film and relates to the technical field of films.The prepared rare earth heat-insulating automobile window film is composed of a hardening layer, a magnetron sputtering film layer, a base material layer, a mounting adhesive layer and a release film layer in sequence and is integrated; the hardening layer is obtained by coating modified polyurethane on the magnetron sputtering film layer and solidifying; the modified polyurethane is obtained by mixing polyurethane prepolymer, modified lanthanum hexaboride and phosphorus-containing silane crosslinking agent; and the prepared rare earth heat-insulating automobile window film has good heat insulation, weather resistance and flame retardance.

The invention aims to solve the problem that the copper SLM printing machinability is poor, so that the performance of the copper SLM is seriously influenced. The preparation method comprises the following steps that S1, material preparation is conducted, specifically, high-purity copper powder and high-purity lanthanum hexaboride powder are mixed, and evenly-mixed powder is obtained; s2, the mixed powder is subjected to additive manufacturing forming through the selective laser melting technology; and S3, linear cutting is conducted, specifically, linear cutting is conducted on the printed lanthanum hexaboride / copper composite material workpiece in a linear cutting mode, and the lanthanum hexaboride / copper composite material is obtained. The preparation complexity and cost of the lanthanum hexaboride / copper composite material are greatly reduced, the prepared lanthanum hexaboride / copper composite material is good in compounding effect, high in strength and toughness and high in conductivity, and new possibility is developed for wide industrial application.

The invention discloses an oxide-doped LaB6 polycrystalline material and a preparation method and application thereof.The preparation method comprises the steps that lanthanum hexaboride and metal oxide are mixed, ball-milled to be uniform and dried to obtain first powder, the metal oxide is an oxide of M, and M is Al, Zr and Ti; the first powder is placed in a mold, the first powder is located in the center of the mold and has the same apparent density, in the inert gas atmosphere, the pressure is increased from the pressure P1 to the pressure P2, heat preservation is carried out for 0.5-3 h at the pressure P2 and the temperature of 1400-2000 DEG C, hot pressing sintering is carried out, cooling is carried out, meanwhile, pressure preservation is carried out for 0-3 h at the pressure P2, the LaB6 polycrystalline material doped with the oxide is obtained, the P1 ranges from 5 MPa to 9 MPa, and the P2 ranges from 20 MPa to 60 MPa. By adding the oxide phase, the sintering temperature of the pure LaB6 ceramic is reduced from 1975 DEG C to 1800 DEG C or below, the conductivity of the LaB6 ceramic is not deteriorated after doping, and the bending strength is effectively improved.

The invention discloses a multiphase ceramic material connector for a fuel cell, the multiphase ceramic material connector is divided into an upper surface layer, a middle matrix layer and a lower surface layer in the height direction, and the upper surface layer and the lower surface layer are both formed by compounding lanthanum hexaboride and hexagonal boron nitride. And the middle matrix layer is formed by compounding titanium diboride and hexagonal boron nitride. According to the invention, the composite ceramic material connector has excellent conductivity, can realize full-temperature-range conductivity from room temperature to high temperature, and has better mechanical properties and machinability.

The application discloses a shielding piece made of a tungsten-based alloy material, a preparation method and application, the tungsten-based alloy comprises a tungsten base and lanthanum hexaboride dispersed in the tungsten base, and the content of boron in the tungsten-based alloy is 0.01wt%-0.5wt%. The tungsten-based alloy in the application introduces lanthanum hexaboride, which is beneficial to the refinement of tungsten grains in the tungsten-based alloy, enhances the toughness of the tungsten-based alloy, reduces the ductile-brittle transition temperature, and improves the absorption capacity of the tungsten-based alloy to neutron irradiation; meanwhile, the introduction of the lanthanum hexaboride does not reduce the heat conduction performance of the tungsten base, but helps to improve the heat conduction performance of the material, which is all beneficial to the improvement of the service life of the shielding piece.

The present application relates to the technical field of composite materials, in particular to a heat and sound insulation PVB interlayer and a preparation method thereof.The present application overcomes the problem of insufficient heat insulation and aging resistance of the PVB interlayer.The PVB interlayer is prepared by mixing the PVB resin pre-plasticized with the silane coupling agent modified reinforcing nanocellulose, and then adding the plasticizer, lanthanum hexaboride loaded with molybdenum trioxide, composite light stabilizer, modified cerium oxide and other additives in sequence, and through casting and hot pressing treatment.The modified lanthanum hexaboride enhances the infrared shielding, the composite light stabilizer and the modified cerium oxide synergistically improve the aging resistance, and the components are synergized through the process to comprehensively improve the heat insulation, sound insulation and aging resistance of the PVB interlayer, which is suitable for the field of high-strength building glass.

The application discloses a barium tungsten lanthanum hexaboride composite hollow cathode, which comprises a cathode tube, a gas inlet is arranged at a first end of the cathode tube, a cathode top is arranged at a second end of the cathode tube, and a cathode top through hole is arranged in the cathode top; a touch electrode is arranged outside the cathode tube, an end of the touch electrode is provided with a touch electrode top, a touch electrode through hole is arranged in the touch electrode top, and the touch electrode is coaxial with the cathode tube; an emitter comprises a first emitter and a second emitter, the first emitter and the second emitter are sequentially arranged on an inner wall of the second end of the cathode tube in a direction from the gas inlet to the cathode top; a heater is arranged around an outer wall of the cathode tube; wherein the first emitter is a barium tungsten emitter, the second emitter is a lanthanum hexaboride emitter, and the lanthanum hexaboride emitter is heated by heat generated by self-sustaining work of the barium tungsten emitter, so that the starting power consumption is greatly reduced.

The X-ray generating device with switchable focus of the present invention includes a high-voltage power supply and an X-ray tube. The X-ray tube is disposed at one end of the high-voltage power supply and includes a cathode assembly, an anode assembly, an electron beam focusing assembly, a housing assembly, and a vacuum assembly. The cathode assembly includes a replaceable cathode unit, which is a lanthanum hexaboride cathode or a zirconium oxide tungsten cathode. By setting the replaceable cathode unit to a lanthanum hexaboride cathode or a zirconium oxide tungsten cathode, free switching between microfocus mode and nanofocus mode is achieved, enabling high resolution and high power output on the same device, and simultaneously meeting the high-precision inspection requirements of chip packaging and the high-power inspection requirements of circuit boards, batteries, etc.

The invention belongs to the technical field of copper-based composite materials, and particularly relates to a high-strength, high-conductivity and high-temperature-resistant copper-based composite rod wire with a nano structure and a preparation method thereof. The preparation method comprises the following steps: mixing nanoscale lanthanum hexaboride powder, nanoscale rare earth oxide powder and copper powder to obtain mixed powder, and carrying out plasma-assisted high-energy ball milling on the mixed powder to obtain composite powder; the composite powder is subjected to cold pressing forming, and a green body is obtained; sintering the green body in a reducing atmosphere to obtain a sintered blank; carrying out hot extrusion on the sintered blank to obtain a blank subjected to hot extrusion; continuously extruding the blank subjected to hot extrusion to obtain a wire blank; and the wire blank is sequentially subjected to cold drawing and annealing treatment, and the high-strength, high-conductivity and high-temperature-resistant copper-based composite rod wire is obtained. The high-strength, high-conductivity and high-temperature-resistant copper-based composite rod wire provided by the invention has ultrahigh strength, high electric conductivity and heat conductivity and excellent high-temperature stability.

The invention provides a polycarbonate material as well as a preparation method and application thereof. The polycarbonate material is prepared from the following components in parts by weight: 100 parts of polycarbonate, 0.01 to 0.1 part of neutral filtering aid, 0.2 to 1 part of surface modified ITO (Indium Tin Oxide) nanowire, 0.1 to 0.6 part of lanthanum hexaboride and 0.05 to 0.3 part of SiO2 coated ZnO, and the neutral light filtering auxiliary agent comprises a combination of CuCr2O4 and Cr2O3. According to the polycarbonate material provided by the invention, through the specific neutral filtering auxiliary agent, it is ensured that after light penetrates through the material, color distortion of a light source is not caused by different transmittance of different wavelengths; by compounding the surface modified ITO nanowire, lanthanum hexaboride and SiO2 coated ZnO, the laser cutting feasibility of the polycarbonate material is improved, and the thickness of a carbonized layer after laser cutting is effectively reduced, so that the size accuracy of a part after laser cutting is ensured.

The invention discloses a rare earth compound composite reinforced tungsten filament and a preparation method thereof, the rare earth compound composite reinforced tungsten filament is provided with a tungsten matrix, nanoscale lanthanum oxide and lanthanum boride are dispersed and distributed in the tungsten matrix, and boron elements are segregated at the grain boundary of the tungsten matrix; the tungsten-LaB6 composite material is prepared from 99.2-99.4 wt% of tungsten powder and 0.6-0.8 wt% of LaB6 powder, the average particle size of the tungsten powder is 1.5-2.5 m, and the average particle size of the LaB6 powder is smaller than 500 nm. According to the invention, lanthanum hexaboride (LaB6) is introduced as a single precursor, in-situ chemical reaction is realized in the hydrogen sintering process, and a dual reinforcement mechanism of nanoscale lanthanum oxide particle generation and boron segregation is realized, so that not only is the pain point in the prior art solved, but also a high-performance material is provided for the high-requirement field; wide industrial application prospects and commercial values are realized.

The invention relates to the technical field of metal materials, and particularly discloses a temperature-controlled step-by-step smelting preparation method of a hydrogen-purified vanadium-platinum alloy, and the hydrogen-purified vanadium-platinum alloy is prepared from the following raw materials in parts by weight: 88-92 parts of a vanadium raw material; 8-12 parts of a platinum raw material; 0.03 to 0.06 part of a primary gas phase activator; and 0.15 to 0.25 part of a secondary composite trapping agent. The first-stage gas-phase activating agent is prepared from nano carbon black and lanthanum hexaboride, and the weight ratio of the nano carbon black to the lanthanum hexaboride is (50: 1)-(60: 1). The secondary composite trapping agent is prefabricated quaternary alloy powder and comprises zirconium, yttrium, boron and silicon, and the weight ratio of the zirconium to the yttrium to the boron to the silicon is 40: 40: 5: 15. According to the method, the first-stage gas phase activator and the second-stage composite trapping agent are adopted for synergistic purification, interstitial impurities can be effectively removed, generation of a brittle hard phase is inhibited, the high-plasticity vanadium-platinum alloy is obtained, and the problems that a traditional material is large in brittleness and difficult to carry out cold rolling machining due to oxygen and nitrogen pollution are solved.

The application provides a rare earth-based temperature-sensitive organic supermolecular gel ice-melting accelerating coating material and a preparation method. The material uses a single-modified columnar arene, has better flexibility than a multi-modified compound, is convenient for producing a structure transition, and a compound modified by four carbon chains has a higher yield than a compound modified by a longer carbon chain, and can generate a substitution reaction faster than the longer carbon chain at normal temperature and pressure. The one-step synthesis method is simple and easy to operate, and connects lanthanum hexaboride to a polymer chain in a chemical bond mode, compensates for the low strength and poor toughness of inorganic nanoparticles and the weak weather resistance and stability of organic matters, and uses a cyan compound which has a strong cavity bonding force with the columnar arene, so that the lanthanum hexaboride is not easy to fall off with a phase transition during ice removal, and thus loses the photo-thermal effect.

This invention provides a rare-earth composite thermosensitive supramolecular gel de-icing material for railways and its preparation method. This gel de-icing material utilizes the photothermal effect of rare-earth nano-borides, such as lanthanum hexaboride, to accelerate ice melting. It also utilizes a thermosensitive supramolecular polymer, which undergoes a gel-sol transition at a specific temperature. In cold weather, its temperature is far below the transition temperature, so it remains in a gel state. However, as the rare-earth nano-borides continuously absorb heat and gradually reach the transition temperature, it becomes a sol state and detaches with the ice layer, thereby solving the railway anti-icing problem.

The application discloses the technical field of metal composite material preparation and relates to a stainless steel-copper-steel three-composite conductive crossbeam manufacturing method. First, a stainless steel pipe, a copper pipe and a carbon steel mandrel are subjected to machining, cleaning and surface treatment; then, oxygen vacancy gradient cerium yttrium zirconium composite oxide solid solution, lanthanum hexaboride and surface-activated hexagonal boron nitride nanosheet composite interface activation material are made into a dispersion liquid and sprayed on a composite interface; after being subjected to grouping, argon protection sealing, segmented heating, hot extrusion, reheating hot rolling, cooling and post-treatment, a stainless steel-copper-steel three-composite conductive crossbeam is obtained. The application further discloses a preparation method of the composite interface activation material, and the prepared conductive crossbeam has corrosion resistance, conductivity and load bearing performance.

An X-ray tube includes a vacuum-sealed tube housing evacuated to a pressure of 10−7 mbar or lower, a cathode assembly inside the housing including an electron emitter adapted to emit electrons when heated at a temperature included in a defined working temperature range and at least one component containing carbon in an amount of at least 20% by weight, especially at least 30% by weight, even more especially at least 50% by weight, the at least one component being preferably designed for holding the emitter, and an anode assembly inside the housing including a target layer for receiving electrons emitted by the electron emitter, wherein the electron emitter preferably includes boride, preferably lanthanum hexaboride (LaB6), and wherein the cathode assembly is designed such that if the emitter temperature is included in the working temperature range.

The invention discloses a polycrystalline lanthanum hexaboride ceramic material and a preparation method and application thereof.The preparation method comprises the steps that lanthanum hexaboride and metal oxide are mixed, ball-milled to be uniform and dried to obtain first powder, the first powder is put into a mold, the first powder is located in the center of the mold and has the same apparent density, and the first powder is put into the mold; in an inert gas atmosphere, increasing the pressure from 6-8 MPa of P1 to 20-60 MPa of P2, keeping the temperature of 1400-2000 DEG C at the pressure P2 for 0.5-3 h to perform hot pressed sintering, cooling, and keeping the pressure at the pressure P2 for 0-3 h at the same time to obtain the polycrystalline lanthanum hexaboride ceramic material, with the P1 being 6-8 MPa and the P2 being 20-60 MPa. Lanthanum hexaboride is doped and modified through the metal oxide, and the work function of the polycrystalline lanthanum hexaboride ceramic material is reduced by utilizing the influence of different metal elements of the metal oxide on the surface potential energy of the lanthanum hexaboride surface.

The invention provides an X-ray generating device which comprises a cathode system, a magnetic deflection system, a magnetic focusing system, an anode system and a vacuumizing system, the cathode system comprises a cathode cavity, a cathode high-voltage assembly and a high-voltage connecting assembly, and the cathode high-voltage assembly comprises a lanthanum hexaboride filament assembly; the magnetic deflection system comprises a magnetic deflection unit; the magnetic focusing system comprises a quadrupole focusing unit and a monopole focusing unit; the anode system comprises an anode target assembly, the anode target assembly comprises a transmission target, and electron beams emitted by the lanthanum hexaboride filament assembly sequentially pass through the magnetic deflection unit, the quadrupole focusing unit and the monopole focusing unit to reach the transmission target. According to the X-ray generation device, the lanthanum hexaboride lamp filament with a smaller emission plane is used as a heat emission source, the two combined focusing units are used for highly compressing the electron beam, and a high vacuum environment is provided, so that the focal point finally irradiated on the transmission target is extremely small, and the resolution ratio and the stability of the X-ray generation device are improved.

The invention belongs to the technical field of transition metal boride-based composite ceramics, and particularly relates to a pressureless sintering in-situ synthesis multi-element eutectic component enhanced boride-based composite ceramic as well as a preparation method and application thereof. The composite ceramic comprises a mixture of the following components in parts by weight: 30 to 40 parts of boron carbide, 10 to 40 parts of carbon powder, 30 to 40 parts of titanium disilicide powder, 30 to 40 parts of zirconium disilicide powder, 30 to 40 parts of chromium disilicide powder, 10 to 100 parts of lanthanum hexaboride powder, 10 to 100 parts of cerium hexaboride powder, 10 to 100 parts of tungsten pentaboride powder, 10 to 100 parts of titanium diboride powder, 10 to 100 parts of zirconium diboride powder and 10 to 100 parts of hafnium diboride powder. The in-situ synthesis eutectic component has a good strengthening and toughening effect on the matrix boride, and the material has good conductivity and electrical discharge machining performance. The composite ceramic has wide application prospects in the fields of aerospace, high-temperature equipment, energy and the like.